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High-toughness cold-work mould steel and preparation method thereof

A die steel, tough and cold technology, applied in the field of high strength and tough cold work die steel and its preparation, can solve the problems of reduced die strength and toughness, die chipping, collapse, etc., and achieves small heat treatment deformation, good strength and toughness, and alloy cost. low effect

Inactive Publication Date: 2010-11-24
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the former is easy to form network carbides, the latter is easy to form banded carbides. Severe segregation of carbides reduces the strength and toughness of the mold, resulting in chipping, fracture or collapse of the mold.

Method used

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  • High-toughness cold-work mould steel and preparation method thereof
  • High-toughness cold-work mould steel and preparation method thereof
  • High-toughness cold-work mould steel and preparation method thereof

Examples

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Embodiment 1

[0027] In this example, the composition and weight percentage of the cold work die steel are as follows:

[0028] C 0.71%, Si 0.70%, Mn 0.76%, Cr 2.32%, Mo 0.25%,

[0029] V 0.25%, Ni 0.68%, Fe balance.

[0030] In the present embodiment, the process and steps of cold working die steel are as follows:

[0031] a. Induction smelting: smelting in an induction furnace according to the above-mentioned ratio of alloying elements, the melting temperature is greater than 1500°C, and then cast into Φ160mm steel ingots and air-cooled;

[0032] b. Electroslag remelting: the poured steel ingot is placed in the electroslag remelting device as a consumable electrode for electroslag remelting, and the liquid metal falls through the slag layer of the slag pool to the water-cooled crystallizer below. re-solidified into steel ingots;

[0033] c. Forging: heating the above steel ingot to a temperature range of 1200-1230°C; initial forging temperature: 1100-1050°C, final forging temperature ≥...

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Abstract

The invention relates to high-toughness cold-work mould steel and a preparation method thereof, belonging to the technical field of alloy steel manufacturing processes. The steel comprises the following chemical components in weight percentage: 0.5%-0.72% of C, 0.6%-0.8% of Si, 0.6%-1.0% of Mn, 2.0%-2.4% of Cr, 0.15%-0.25% of Mo, 0.1%-0.25% of V, 0.5%-0.8% of Ni and the balance of Fe. The preparation method of the cold-work mould steel comprises the following steps of: mixing the raw materials according to the a formula, smelting and pouring the batch mixtures in an induction furnace, and then carrying out electroslag remelting; and then forging and annealing, heating the mixtures to 850-930 DEG C for austenitization, and then carrying out secondary annealing at 180-200 DEG C after oil quenching to finally obtain the high-toughness cold-work mould steel. The cold-work mould steel has higher toughness matching and higher hardness and is a steel type suitable for manufacturing precise complex moulds.

Description

technical field [0001] The invention relates to a high-strength and tough cold-working die steel and a preparation method thereof. The die steel alloy has low alloy cost, has a good combination of strength and toughness, is suitable for manufacturing precision and complex dies, and belongs to the technical field of alloy steel manufacturing technology. Background technique [0002] Molds are the basic process equipment for industrial products such as machinery, electronics, automobiles, communications, and home appliances. As a basic industry, the quality, precision and life of molds play a very important role in the development of other industries, and play an indisputable key role in the development of the national economy. Cold work die steel is mainly used for stamping, blanking, forming, bending, cold extrusion, cold drawing, powder metallurgy molds, etc., and requires high hardness, high wear resistance and sufficient toughness. It is generally divided into two catego...

Claims

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Application Information

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IPC IPC(8): C22C38/46C21D1/18C21D1/26
Inventor 汪宏斌邓黎辉吴晓春李绍宏邓亚琪
Owner SHANGHAI UNIV
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